Dell 5110cn Service Manual page 195

- About Sensor
There are two types of the sensor in the printer, one is reflective type, and another is transmissive
type.
A reflective type sensor detects, on the basis of whether or not the light is reflected by the sheet,
the paper absence/presence or the sheet such as OHP transparency or others.
A transmissive type sensor is composed of the light-emitting side and the light-receiving side that
are placed opposite to each other allowing the light to pass from the former to the latter. On the
basis of whether or not the light path is blocked due to the actuator, etc., the sensor detects the
paper absence/presence or the moving part position such as at the home position or elsewhere.
The following table shows the correspondence between the sensors and the types.
Reflective type (Diag. Code)
Transparency
-
2 - 17
Actuator
Leg_Sec02_016FA
Transmissive type (Diag. Code)
Full Stack Sensor (DI-0)
DUP Jam Sensor (DI-1)
Exit Sensor (DI-2)
REGI Sensor (DI-3)
MSI No Paper Sensor (DI-10)
Tray 1 No Paper Sensor (DI-11)
Tray 2 No Paper Sensor (DI-12)
Tray 3 No Paper Sensor (DI-13)
Tray 4 No Paper Sensor (DI-1e)
BTR Toner Full Sensor (DI-23)
No Toner Sensor Y (DI-18) (Internal signal)
No Toner Sensor M (DI-19) (Internal signal)
No Toner Sensor C (DI-1a) (Internal signal)
No Toner Sensor K (DI-1b) (Internal signal)
Chapter 2 Operation of Diag.
Paper
Leg_Sec02_015FA